If so: Is the video definitely uploaded? I tried to hit http://www.dettwyler.org/RooftopRites.flv and I get a 404 error. It appears as though the SWF is loading correctly (if you right-click you get the Flash right-click menu, and no errors appear - also, if you roll over the bottom area it appears as though the skin is appearing)

If the video is definitely up there and in the correct location:

Is the server set-up to serve up FLV files? If you maintain the server, check for the FLV MIME-TYPE - if you don't, ask whoever does to do so. That is the typical culprit in cases like these, where it appears as though the SWF is loading correctly, but the video isn't displaying.

All links inside of the SWF need to be relative to the location of the HTML file.

So, it looks like you moved the video files into a folder cvalled: "index_html_files" but did not update the paths in the SWF to point at that folder. (As I try to hit the FLV directly, it appears as though it is in both locations, so the FLV still loads from the root, next to the HTML at the moment)

And lastly, I just tried everything with a new directory. SWF and HTML point to E:\Movies\test. The skin was selected and not modified. Everything published to the target directory. The movie plays and yet, there is no skin.